1 . 先化简,再求值
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5538bcef820b44820637bc8d8842c3ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
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2024八年级下·江苏·专题练习
2 . 计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a1c616497fae4c66f61beff691edc4.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a1c616497fae4c66f61beff691edc4.png)
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3 . 计算:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe47766f5db96d4e462237370dba381.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62d642b93a03b89257641e07e9d2942.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79af3e65bf19acf43568d16f51d736ed.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c693664b2ceeab7350923b332539916f.png)
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2024八年级下·江苏·专题练习
4 . 计算:
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49c3fd9f848d9329b40daa6e277cdfd.png)
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5 . 计算:
(1)
;
(2)
;
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0516e54aa9e75c74b0b06a9b563b26.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6911f37e9c0a50e63af66f77ad428572.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6f50d5c50051ca3b8831591368f02a.png)
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名校
6 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b76a763e16272d3a6e9588c7a8c4ec2.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6ce8a3e77d9b1064f9a6cbf6601e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b76a763e16272d3a6e9588c7a8c4ec2.png)
您最近一年使用:0次
2024-06-03更新
|
186次组卷
|
2卷引用:江苏省扬州市江都区邵樊片2023-2024学年七年级下学期期中数学试题
名校
7 . (1)计算:
;
(2)化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938f9bdca665f7b3569b35bdf689a22.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b54b4167c4973c2c1c6f4803999c55f.png)
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8 . 计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f7ce247e7916ae16cfd72feb3e7ab6.png)
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f7ce247e7916ae16cfd72feb3e7ab6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776def26a6c70f357688ae501660f456.png)
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9 . 已知
求下列各式的值:
(1)
和
;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8587573283f0cd1ce2b85671684c5e7e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f6407cbc1670813405a91e3f8ef9c7.png)
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10 . 定义:我们将
与
称为一对“对偶式”.
因为
,可以有效的去掉根号,所以有一些题可以通过构造“对偶式”来解决.
例如:
,所以
与
互为“对偶式”.
(1)
的“对偶式”是________,
的“对偶式”是________.
(2)已知
,其中
.
①
的“对偶式”的值是________.
②利用“对偶式”的相关知识,求方程
中x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9928ba39cdd5878aced506d3dbb9fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b87033f1efe85e559a9a3efc985be9d.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50036f42d68bcb48ee54bf6a8e76856f.png)
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9716b80c5256540830bd48ad968f5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e833d2c9f895f404a733a7d389e3b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acba2d76c389f6f53cc8cf757760cd02.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77abd3f77c42e53acb598fbc64cc22f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63319272787a2c3137212e4d11b0e887.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c3a00640f05c28e85b3d2e2ba562f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d16f50c58699f352885df1f7bc9132.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63319272787a2c3137212e4d11b0e887.png)
②利用“对偶式”的相关知识,求方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c3a00640f05c28e85b3d2e2ba562f9.png)
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